<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<style type="text/css">
    div{
        width: 300px;
        height: 300px;
        background:palevioletred;
        box-shadow: 18px 18px 18px red;
        border-radius: 10px;
    }
   span {
       text-align: center;
       font-size: 30px;
       color: aqua;
       text-shadow: 5px 5px 5px yellow;
   }
</style>
<body>
<div id="box1">
    <span>这是盒子里的文字</span>
</div>
</body>
</html>